Check-valve.



'PATENTED FEB. 20, 1906.

M. L. SANBORN.

CHECK VALVE.

APPLICATION FILED I'EB.10,19.05.

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MOSES L. SANBORN, OF BOSTON, MASSACHUSETTS.

CHECK-VALVE.

Specification of Letters Patent.

Patented Feb. 20, 1 906.

Application filed February 10, 1905. Serial No. 245,006.

[ all whom, it nuty concern:

Be it known that I, Mosns L. SANBoRN, a citizen of the United States, residing at Boston, in the county of Suffolk and State of-Massachusetts,have invented certain new and useful Improvements in Check-Valves, of which the following is a specification, reference being had therein to the accompanying drawlngs.

My invention relates to check-valves to be used in liquid-dispensing apparatus. In apparatus of this nature designed to prevent the liquids from remaining in the discharge or delivery pipes when they are not required to be drawn for any length of time and the liquids are returned to their respective barrels by pneumatic pressure or otherwise, which obviates the necessity of drawing off or wasting the liquid which has become deteriorated or stale by standing in the pipes over night, it is necessary to have a supplemental pressurepipe leading from the source of pneumatic pressure and communicating with the outletpipes which lead from each barrel, and it is necessary to have a check-valve to control each of such points of communication, whereby the contents of the barrel or barrels are prevented from entering the supplemental pressurepipe or backing up into the pipe when the apparatus is not in use. If no check-valves control these points of communication between the supplemental pipe and the outlet-pipes, where more than one barrel is used there would be a mixture of the several liquids within the supplemental pipe, and it is also desirable that the check-valves be so constructed as to be entirely free from leakage, so that the liquid would not be forced into the supplemental pipe and from there into the first barrel into which the liquidfrom its discharge-pipe was returned by the pressure-opening of one of the check-valves controlling communication between the supplemental pipe and that particular discharge-pipe, as a mixture of the several liquids in entering the receptacle containing one of the said liquids would destroy the integrity of said liquids.

It has been found from experiments that only certain forms of check-valves can be used on liquid-dispensing apparatus and that said check-valves must be made absolutely leakagetight.

The invention consists in the combination of elements and in certain forms of construction entailed in the combination of said elements to obtain the desired result.

A full understanding of the invention, which is an improved check-valve so constructed as to be entirely tight, can best be given by a detailed description of a preferred construction embodying the various features of the invention, and such a description will now be given in connection with the accompanying drawings, and I attain my object by the mechanism there illustrated, showing such preferred construction, and the features forming the invention will then be specifically pointed out in the claims.

In said drawings, Figure 1 represents a perspective View of the coupling-piece and'its adjacent parts. Fig. 2 is a detail side sectional view of the coupling-piece and showing my improved check-valvef Fig. 3 is a front sectional view of the coupling-piece on the line 3 3 of Fig. 2, showing the valve. Fig. 4 is a front elevation of the check-valve when the valve isopen. Fig. 5 is a front elevation of said valve when closed. Fig. 6 is a sectional view of the valve when opened. Fig. 7 is a view on the line 6 6 of Fig. 4.

Latitude is allowed herein as to details, as they may be changed or varied at will without departing from the spirit of my invention and the same yet remain intact and be protected.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The receptacle containing the liquid, which is ordinarily a barrel in the cooling-cellar on the floor below the bar, is not here shown; but from this receptacle passes the discharge or delivery pipes 7, having a discharge-faucet 8, which may be of any construction. The supplemental air-pipe 9, sometimes being a direct connection from the back-pressure pipe, may run above or below the discharge-pipe, as the reversing of the coupling-piece, which is situated between the discharge-pipe 7 and the supplemental pipe 9 and which contains the check-valve, will not affect the proper working of the check-valve; but it is preferable to run the supplemental pipe 9 below the discharge-pipe 7 and immediately back of the discharge-faucet. as shown in Fig. 1. The coupling-piece located just back of the delivery-faucet 8 is so arranged as to connect the supplemental pipe 9 with the dischargepipe 7 without rearranging any of those parts where the system is to be applied to a bar already equipped with a main pressure-pipe and delivery-pipes in the usual way. This coupling piece which contains the check valve is shown as having the three stem portions 10, 14, and 11; but, if desired, the stem portions 10 and 14 may be made in one piece, as clearly shown in Figs. 1 and 3 of the drawings. Into the stem 10 would be inserted one end of the supplemental pipe 9, having the air-passage 18, and a cap (not shown) would be fitted to the other end of the stem 10; but where more than one discharge-faucet 8 is used a pipe 18 (shown in Fig. 1) will connect the other end of the pipe 10 to the next pipe 10. The stem portion 14 has its upper portion threaded, as at 15, for receiving the cap 16, which covers the upper part of the checkvalve, and between the stem portion 14 and the cap 16 may be inserted a packing 36, and through the stem extends an air-passage 19, connecting at the bottom with the air-' passage 18 in the stem 10, which air-passage 18 is a continuation of the passage 18 of the supplemental pipe 9. The upper portion of the air-passage 19 enters into the air-chamber 16, formed in the upper enlarged part 14 of the stem 14, and a duct 36 connects this air-chamber 16 with the passage 17 in the stem portion 11 of the coupling, which passage 17 connects the passage in the faucet with the passage 17 in the delivery-pipe, so that it is readily seen that liquid passing from the receptacle in the cooling-cellar up and into the discharge-faucet 8 does not have to pass through the check-valve and only has to pass through the passage 17 of the stem 11 of the coupling, but that when thedischargefaucet 8 is closed and the pneumatic pressure applied and allowed to go up through the supplemental pipe 9 and into the coupling the pressure passes through the passages 18 19 16, then down through the duct 36 into the passages 17 and 17, driving the liquid back into the receptacle in the cellar, and that the use of a check-valve is not to prevent the pneumatic pressure passing into the discharge-pipe, but is solely to prevent the liquid from passing (when the pneumatic pressure is turned off from the supplemental pipe) into the supplemental pipe, clogging it and rendering it useless. The couplinggland 12 connects the discharge-pipe 7 and the stem 11. The gland 13 connects the faucet 8 and the stem 11. The coupling above a the point where the stem portion 14 joins the stem 11 is enlarged, as at 14, forming a chamber 16, and in this chamber is inserted the check-valve, which has the lower portion of its stem-plug threaded, as at 25, so that it can be screwed upon the thread 21 on the inner side of the stem 14, which has the upper portion of its passage 19 slightly enlarged, so

as to properly receive the lower portion of the stem-plug, and a packing 24 is preferably inserted between the rim '23 of the checkvalve and the seat 24, which seat is formed on the inner side of the stem 14, as at 24.

Through the stem-plug22 of the checkvalve and lengthwise of it extends a passage 19, which is reduced in size at its end, as at 33, so as to limit the amount of pressure passing through the stem-plug 22; but the smaller passage or duct 33 is made very short, so that it will not readily clog, and if it becomes clogged can be easily cleaned. The upper portion of the stem-plug is preferably conical, so that its cap 28 'can fit tightly down upon it, which caphas an inner lining of cork or other suitable material 35 to make the cap leakage-tight.

Around the lower part of the cap 28 ex tends the groove 31, and through the lower rim 29 of the cap and into the groove 31 extends a series of bolts or pins 32, having their upper ends flattened against the upper side of the rim 29, as at 31, and these pins hold at their lower end a plate 30, which encircles the st'em plug 22 and against which presses the spiral spring 27, also encircling the stem-plug and within the pins 32. This spring 27 acts against a plate 26, made a part of or rigidly attached to the stem-plug 22, and this spring 27 holds the cap 28 down tight upon the duct 33 except when the pressure coming up through this duct is greater than the contracting pressure of the spring. I

Having thus described my invention, I claim as new and desire to secure by Letters Patent r I Q 1. A check valve for dispensing apparatus comprisinga coupling consisting of an upright stem having a passage enlarged at its upper part, a horizontal stem at the lower end of the upright stem, a horizontal stem connected at the upper part of the upright stem at right angles to both stems, a passage extending diagonally downward from the en'- largedpassage in the upright stem into the upper horizontal stem, a supplemental pipe connected with the lower horizontal stem, a

delivery-pipe connected withthe upper horizontal stem, a stem-plug screwed into the upright stem having a passage throug'h it so that pressure from the supplemental pipe to the delivery-pipe must first pass through the stem-plug and'a spring-seated lined capfor the top of the stem-plug for normally closing the stem-plug and preventing the flow of liquid into the supplemental pipe, substantially as shown and described.

2. A check-valve for dispensing apparatus comprising an upright stem, a horizontal stem at the lower end of the upright stem, a

horizontal stem connected to the upper part of the upright stem at right angles to both stems, a passage extending from the lower horizontal stem through the upright stem and enlarged at its upper part, a stein-plug I point lower than the cap, diagonally downinserted in the passage and having a passage ward into the other horizontal stem, subextending through it, the upper portion of stantially as shown and described. the passage being of less diameter than the In testimony whereof I afliX my signature 5 lfower portion, spl that any substanoehpasslilng in presence of two witnesses.

rom the lower orizonta stem to t e ot er horizontal stem must first pass through the MOSES SANBORN' plug, a spring-0perated cap for normally Witnesses: closing the plug, and a passage extending HOWARD F. BUTLER, 10 from the passage in the upright stem and at a EMMA M. YOUNG. 

